EP-4738599-A1 - BATTERY UNIT AND BATTERY PACK COMPRISING SAME

EP4738599A1EP 4738599 A1EP4738599 A1EP 4738599A1EP-4738599-A1

Abstract

The present disclosure relates to a battery cell and a battery pack including the same. The battery cell includes a housing; a cell assembly, wherein the cell assembly comprises a jelly roll and a plurality of first tabs and a second tab, the plurality of first tabs and the second tab are electrically connected to the jelly roll, the plurality of first tabs are spaced apart, the plurality of first tabs and the second tab are spaced apart in a first direction X and have opposite polarities; a top cover; a first terminal post, electrically connected to the plurality of first tabs; a second terminal post, electrically connected to the second tab. In the present disclosure, by arranging the battery cells in the battery pack, not only the space utilization can be improved, but also the fast-charging performance can be enhanced.

Inventors

CHEN, GUODONG
TAN, JIAN
GE, Rongyun
FANG, Zewei
ZHOU, Zaoyuan

Assignees

Sunwoda Mobility Energy Technology Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20240311

Claims (12)

A battery cell, characterized by comprising: a housing (1), having an opening (11); a cell assembly (8), disposed in the housing (1), wherein the cell assembly (8) comprises a jelly roll (2) and a plurality of first tabs (3), the plurality of first tabs (3) are each disposed at an end of the jelly roll (2) facing the opening (11) and electrically connected to the jelly roll (2), and the plurality of first tabs (3) are arranged at intervals in a first direction (X); a top cover (5), disposed at the opening (11) and covering the opening (11); a first terminal post (6), arranged on the top cover (5), wherein the first terminal post (6) is welded to the plurality of first tabs (3) simultaneously to electrically connect the first terminal post (6) to the plurality of first tabs (3).
The battery cell according to claim 1, characterized in that the battery cell further comprises: a second terminal post (7), arranged on the top cover (5); wherein the cell assembly (8) further comprises a second tab (4) disposed at the end of the jelly roll (2) facing the opening (11) and electrically connected to the jelly roll (2), the plurality of first tabs (3) and the second tab (4) are spaced apart in the first direction (X), the second tab (4) has opposite polarity to the plurality of first tabs (3), and the second terminal post (7) is welded to the second tab (4) to electrically connect the second terminal post (7) to the second tab (4).
The battery cell according to claim 2, characterized in that a plurality of the second tabs (4) are provided, the second terminal post (7) is welded to the plurality of the second tabs (4) simultaneously, and a number of the plurality of first tabs (3) is different from that of the plurality of the second tabs (4).
The battery cell according to claim 2, characterized in that in the first direction (X), a numerical relationship among a length L 1 of the jelly roll (2), a number N 1 of the plurality of first tabs (3), a length L 2 of each of the plurality of first tabs (3), a number N 2 of the second tabs (4) and a length L 3 of each of the second tabs (4) is as follows: 1/3 < (N 1 ×L 2 +N 2 ×L 3 )/L 1 < 2/3.
The battery cell according to claim 1, characterized in that the plurality of first tabs (3) are staggered in a second direction (Y), and the first direction (X) and the second direction (Y) are intersected.
The battery cell according to claim 1, characterized in that the plurality of first tabs (3) are limited to two first tabs (3), and a projection of the first terminal post (6) onto a plane of the top cover (5) has overlaps with projections of the two first tabs (3) onto the plane of the top cover (5), enabling the first terminal post (6) to be welded to the two first tabs (3) simultaneously.
The battery cell according to claim 6, characterized in that in the first direction (X), the first terminal post (6) is positioned in a position between the two first tabs (3), allowing a portion of the first terminal post (6) contacting one of the two first tabs (3) to be welded to the one of the two first tabs (3).
The battery cell according to claim 6 or claim 7, characterized in that in a second direction (Y), the first terminal post (6) is positioned in a position between the two first tabs (3), allowing a portion of the first terminal post (6) contacting one of the two first tabs (3) to be welded to the one of the two first tabs (3); wherein the first direction (X) is intersected with the second direction (Y).
The battery cell according to claim 2, characterized in that a plurality of the cell assemblies (8) are provided, the pluralities of first tabs (3) of the plurality of cell assemblies (8) are welded together, and the second tabs (4) of the plurality of cell assemblies (8) are welded together, so that the plurality of the cell assemblies (8) are connected to one another.
The battery cell according to claim 1, characterized in that the battery cell further comprises: a connecting piece, wherein the connecting piece is arranged between the first terminal post (6) and the plurality of first tabs (3) in a third direction (Z), and the connecting piece is welded to the first terminal post and each of the plurality of first tabs (3) respectively, allowing the first terminal post (6) to be welded to the plurality of first tabs (3) simultaneously; wherein the third direction (Z) intersects the first direction (X).
The battery cell according to claim 1, characterized in that a distance between immediately adjacent two of the plurality of first tabs (3) in the first direction (X) is defined as L 4 , and 6 mm ≤ L 4 ≤ 18 mm.
A battery pack, characterized by comprising: a shell; a plurality of the battery cells according to any one of claims 1-11, arranged in the shell and electrically connected to one another.

Description

CROSS REFERENCE TO RELATED DISCLOSURES The present disclosure claims the benefit of Chinese Patent Application No. 202321880697.7, filed on July 18, 2023, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to the field of new energy technology, and in particular to a battery cell and a battery pack including the same. BACKGROUND In the field of lithium batteries, the current-carrying area formed between tabs and electrodes is usually increased to improve charging efficiency of a battery. In the related techniques, the tabs are usually connected to the electrodes in a one-to-one correspondence, resulting in long charging time and poor fast-charging performance. SUMMARY OF THE DISCLOSURE An objective of the present disclosure is to provide a battery cell and a battery pack comprising the battery cell, and the battery cell can have improved space utilization. To achieve the above objective, the present disclosure provides a battery cell, comprising: a housing, having an opening;a cell assembly, disposed in the housing, wherein the cell assembly comprises a jelly roll and a plurality of first tabs, the plurality of first tabs are each disposed at an end of the jelly roll facing the opening and electrically connected to the jelly roll, and the plurality of first tabs are arranged at intervals in a first direction;a top cover, disposed at the opening and covering the opening;a first terminal post, arranged on the top cover, wherein the first terminal post is welded to the plurality of first tabs simultaneously to electrically connect the first terminal post to the plurality of first tabs. In some examples of the present disclosure, the battery cell further comprises: a second terminal post, arranged on the top cover;wherein the cell assembly further comprises a second tab disposed at the end of the jelly roll facing the opening and electrically connected to the jelly roll, the plurality of first tabs and the second tab are spaced apart in the first direction, the second tab has opposite polarity to the plurality of first tabs, and the second terminal post is welded to the second tab to electrically connect the second terminal post to the second tab. In some examples of the present disclosure, a plurality of the second tabs are provided, the second terminal post is welded to the plurality of the second tabs simultaneously, and a number of the plurality of first tabs is different from that of the plurality of the second tabs. In some examples of the present disclosure, in the first direction, a numerical relationship among a length L1 of the jelly roll, a number N1 of the plurality of first tabs, a length L2 of each of the plurality of first tabs, a number N2 of the second tabs and a length L3 of each of the second tabs is as follows: 1/3<(N1×L2+N2×L3)/L1<2/3. In some examples of the present disclosure, the plurality of first tabs are staggered in a second direction, and the first direction and the second direction are intersected. In some examples of the present disclosure, the plurality of first tabs are limited to two first tabs, and a projection of the first terminal post onto a plane of the top cover has overlaps with projections of the two first tabs onto the plane of the top cover, enabling the first terminal post to be welded to the two first tabs simultaneously. In some examples of the present disclosure, in the first direction, the first terminal post is positioned in a position between the two first tabs, allowing a portion of the first terminal post contacting one of the two first tabs to be welded to the one of the two first tabs. In some examples of the present disclosure, in a second direction, the first terminal post is positioned in a position between the two first tabs, allowing the portion of the first terminal post contacting one of the two first tabs to be welded to the one of the two first tabs; wherein the first direction is intersected with the second direction. In some examples of the present disclosure, a plurality of cell assemblies are provided, the pluralities of first tabs on the pluralities of cell assemblies are welded together, and the second tabs of the plurality of cell assemblies are welded together, so that the plurality of cell assemblies are connected to one another. In some examples of the present disclosure, the battery cell further comprises: a connecting piece, which is arranged between the first terminal post and each of the plurality of first tabs in a third direction Z; the connecting piece is welded to the first electrode and each of the plurality of first tabs respectively, allowing the first terminal post to be welded to the plurality of first tabs simultaneously;wherein the third direction is intersected with the first direction. In some examples of the present disclosure, a distance between immediately adjacent two of the plurality of first tabs in the first direction is defined as L4, and 6 mm ≤ L4 ≤ 1